2A, 2MHz, Synchronous Step-Down Converter


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The RT8077 is a high efficiency synchronous, step-down DC/DC converter. Its input voltage range is from 2.6V to 5.5V and provides an adjustable regulated output voltage from 0.8V to 5V, while delivering up to 2A of output current.

The internal synchronous low on-resistance power switches increase efficiency and eliminate the need for an external Schottky diode. The switching frequency is set by an external resistor or can be synchronized to an external clock. The 100% duty cycle provides low dropout operation extending battery life in portable systems.

Current mode operation with external compensation allows the transient response to be optimized over a wide range of loads and output capacitors.

The 100% duty cycle in Low Dropout Operation further maximize battery life.

The RT8077 is available in the WDFN-8L 2x2 package.


  • Portable Instruments
  • Battery-Powered Equipment
  • Notebook Computers
  • Distributed Power Systems
  • IP Phones
  • Digital Cameras
  • Dynamic Supply Bias for GSM/EDGE PAs and 3G/4G PAs
  • LCD TV
Key Spec.
Status Active
Vin (min) (V) 2.6
Vin (max) (V) 5.5
Number of Outputs 1
Vout (min) (V) 0.8
Vout (max) (V) 5
Output Adj. Method Resistor
Iout (max) (A) 2
Current Limit (typ) (A) 3.0
Freq (typ) (kHz) 1800
Freq (min) (kHz) 300
Freq (max) (kHz) 2000
Ext Sync No
Ron_HS (typ) (mOhm) 90
Ron_LS (typ) (mOhm) 90
Iq (typ) (mA) 0.27
Features Current Mode Control;Cycle-by-Cycle Current Limit;Enable Input;Internal Compensation;OCP;PSM;Stable with Ceramic Capacitor;UVP
Package Type WDFN2x2-8
  • High Efficiency : Up to 95%
  • Low RDS(ON) Internal Switches : 90mΩ
  • Programmable Frequency : 300kHz to 2MHz
  • No Schottky Diode Required
  • 0.8V Reference Allows for Low Output Voltage
  • Low Dropout Operation : 100% Duty Cycle
  • 2.6V to 5.5V Input Voltage Range
  • VOUT Range from 0.8V to 5V
  • Up to 2A Output Current
  • Thermal Shutdown
  • RoHS Compliant and Halogen Free
TitleLast UpdateShareDownload
2A, 2MHz, Synchronous Step-Down Converter2013/06/26
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Reference Design
TitleLast UpdateShareDownload
Richtek Load Transient Tool2021/01/21
Part NumberPackage TypePackage Qty.Free SampleBuy From Authorized Distributor
RT8077GQWWDFN2x2-82500 Not available Buy from Distributor